It's a dynamic phrase that could be used to say someone's attractive, or if food looks good. It's antonym is "cook it down" which could mean that someone's nasty, shouldn't sport that type of clothing, or if the food isn't as good as you thought.
(hot chick jogs by) "Mmm, cook it up!"
"What's for lunch today?"
"Chicken fajitas."
"Mmm, cook it up!"
(someone girl's pasty ass crack hanging out) "Uhh, cook it down! Cook it way down!!"
Someone who is addicted to obtaining money and building wealth. A money addict and fanatic. Breadheads often work more than one full-time job, and some even participate in illicit activities to "obtain the bread".